Thermoelectric properties in the misfit-layered-cobalt oxides [Bi 2A2O4][CoO2]b1/b2 (A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98) single crystals

Wataru Kobayashi, S. Hébert, H. Muguerra, D. Grebille, D. Pelloquin, A. Maignan

研究成果: Conference contribution

22 被引用数 (Scopus)

抄録

Single crystals of different phases of misfit cobalt oxides have been synthesized. Using these materials, the intrinsic power factor has been determined. By combining thermopower 5 and Hall coefficient measurements, we will show how S can be tuned by doping in this family of materials, the doping being strongly dependent on the misfit ratio p=b1/b2 ([Bi2A2O4][CoO2]b1/b2 with A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98). The in-plane resistivity also strongly depends on the doping : the more metallic samples are obtained for the largest carrier concentration, i.e. the smaller S value. The combination of these two factors leads to an important conclusion that the power factor is independent of the doping in these Bi-based materials converging to a unique value of 2.2±0.3 μW/cmK2 at room temperature, which is not so trivial. We will discuss the origin of the almost unique value of 2.2±0.3 μW/cmK2.

本文言語English
ホスト出版物のタイトルProceedings ICT'07 - 26th International Conference on Thermoelectrics
ページ117-120
ページ数4
DOI
出版ステータスPublished - 2007
外部発表はい
イベントICT'07 - 26th International Conference on Thermoelectrics - Jeju, Korea, Republic of
継続期間: 2007 6 32007 6 7

Other

OtherICT'07 - 26th International Conference on Thermoelectrics
CountryKorea, Republic of
CityJeju
Period07/6/307/6/7

ASJC Scopus subject areas

  • Engineering(all)

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